Pump



PUMP

F. M. GILSTRAP ET AL Filed Sept. 18, 1931 n Nov. 7, 1933.

Patented Nov. 7, 1933 Frank M. Gilstrap and `Fred W. Baurmanm Bar- I y ranca Bermeja, Colombia u Application september 1s, 199.1V

Y serial No. 563,569

" 7 Claims.v (o1. 'i4-#14) VOur invention relates to a pump and has for its principal objects, the provision of a relatively simple, practical and inexpensive pump that is especially designed for use in pumping `oil or water from deepv wells and further, to provide a pump of the character referred to that is mounted on rolling supports in order that it may be readily shifted away from the well in order to permit pump rods and tubing to be readily withdrawn from the well.

Further objects of our invention are, to' provide improved means .for counterbalancing the weight of the pump ro'd during its reciprocatory movement, to provide a pump that is devoid of the usual cranks and consequently eliminatingr the Whip and vibration that occurs whereordinary cranks are used in connection with a long string of polish rods, further, to provide a pump having a minimum number of gears and other machined parts and further, to provide a counterbalanced pump that will develop the'smoothest lpossible pumping motion during all points of the pumping cycle.

With the foregoing and other objects in'view, our invention consists in certain novel features of construction and arrangement of parts that will hereinafter be more fully described and claimed and illustrated in the accompanying drawing in which:

Fig. 1 is a front elevational view of apump constructed in accordance with our invention;

Fig. 2` is a vertical cross section taken approximately on the line 2--2 of Fig. 1.

Fig. 3 is a front elevational View of 'al-modified form of the pump.

Fig` 4 is a vertical cross section taken approximately on line 4 4 of Fig. 3... Referring by numerals to the accompanying drawing, particularly to the construction illustrated in Figs. 1 and 2, 10 designatesV a substantially rectangular frame work that is preferably formed of angle bars or other structural vshapes and applied to the sides of this frame Work are sheets or panels 11, preferably of sheet metal;

VArranged at the lower corners of the frame work are small rollers or castorsk12 which enables the frame and parts carried'thereby to be readily moved over a comparatively smooth sur-V face.

Suitably secured on top ofthe frame and at the front and rear thereof are bearingsv 13for a shaft 15 and secured to the ends of said shaft are eccentrics 16 that are arranged directly opposite to each other or 180 apart.

Secured to the intermediate portion ofshaft 15 is a'worm wheel 17 that visY enclosed by a suitable housing 18 and which worm wheel meshes with the worm 19 that is `mounted on a shaft 20. "Y'YIhis shaft 20 'is journaled for rotation in suitable bearings and it occupies a positionl below and at B0 right angles tothe shaft 15. v

Shaft 20 is suitably driven by means of pulleys and a belt or sprocket Wheels and a chain 'from an electricmotor 21 that is suitably within the frame work 11.

"Suitably'secured ron the front wall of the pump below the front end of the shaft' 15 andthe eccentric that is carried by the front end of said shaft,

supported os' are vertically disposed parallel guides or bearings 22 and arranged for vertical movement between 70 said guides arerollers 29 that areV mounted" to rotate freely upon the ends of a short horizontally disposed shaft 30.

i Depending from shaft 30`is a yoke orhanger 31 to which is. connected the upper end 'of ya rod 75 32,and the lower end of the latteris detachably securedin any suitable manner to the upper end of the pump or polish rod 33'.

' A yoke 34 encircles the eccentric on'the forward end of shaft'15 and depending from said yoke is r 8 a short arm 35 having its llower end journaled on the intermediate portionv of shaft 30'.

Encircling-the eccentric on the `rear Vend of shaft 15 is a yoke 36from which depends a short arm 37 and the lower end of sai'darm is joury naled-,on a'short transverse shaft Vand the lattercarrying rollers`39 thatAV operate between vertical guides or bearings 40. f

rThese guides or bearings are secured on: the rear Journaledonthe shaft 38 is theupper endof a depending yoke or hanger 41 and detachably Vsecured thereto is the upper end'of a depending rod 42, upon the lower portion of whichgi's rel` wall of the pump below the rear end of shaft'15. 90

movablymounted a plurality of counterbal'ancing 95 weights 43. .l

In the operation of our improved pump, as de'- scribed, the worm 19 on motor'driven shaftZO im- `parts rotary motion to wormwheel 17 Athat is carried by shaft 15 and, as said shaft is rotated, 100

the eccentrics 16 Yon the ends'- thereof acting through yokes 34 and 36 impart vertical lreciprocating movement to the shafts 30 and 38 `that :carry the rollers 29 and 39. l V""Inasmuch as the eccentricslare'oppositely 105 arranged with respect to each other, the counter-l balancing Vweights 43, that are suspended from shaft 38 move downwardly as the pump or polish 'rod 33 that is connected to shaft 30 moves upvardly and vice versa. l

The parts 29, 30, 31 and 32 operate in a true vertical plane and consequently there are no side strains impressed on the upper end of the polish rod at any time during its reciprocatory travel.

The parts 38, 39, 41 and 42 that carry the counterbalancing weights 43 likewise move in a straight vertical line and as the weights 43 practically counterbalance the weight of polish rod, the operation of the latter is accomplished with a maximum degree of smoothness throughout the entire pump cycle.

Inasmuch as the pump frame is mounted onV rollers it may, after detaching rod 32 from the Figs. 3 and 4, the ends of shaft 15 carry cams,-

44 that engage beneath rollers 45 and the latter being mounted on the central portions of shafts 46 and each shaft carrying a pair of rollers47 that operate between Vertical guides 48.

Dependingfrom each shaft 46 is a hanger of yoke 49, the rear orinne'r. portion of 'which is slotted for the accommodation of the shaft 15 and the yoke on the front of the pump is detachably connected by a rod 50 to the pump or polish rodand suspended from` the yoke on the rear side of the machine is a series of counterbalancing Weights 51;

In this form of pump the cams 44, `which are ydisposed 180, apart'lift the rollers 45 as said cams move 'upwardly,'thereby imparting vertical reciprocatory movement to the polish rod and the operation of the pump during the entire pumping cycle is rendered smooth and vibrationless by the provision andarrangement of the counterbalancing weights 51'. Y l

jThusit willbe seen that we have provideda pumping'unit that is relatively simple in construction, 'inexpensive of manufacture and very effectivein performing the functions for which it is intended.

Our improved pump is especially designed to impart smoothyibrationless straight line reciprocatory movementto the polish rod of a pump and the construction of the puin is such that it may be easily and conveniently moved into and out of position for use and through the use of eccentrics or their equivalent, the desired results are attained without the Vuse of gears, pinions and other machined parts with the exception of a single worm and worm Wheel that are utilized between the driving motor and the eccentric carrying shaft. j l f It will be understood that minor changes inthe size," ,form and construction of the various parts of4 our vimproved pump may be made and substituted `for those hereinfshown anddescribed without departing from the spirit o f ourinvention, the scope of whiehis set forth in the aplower portions of said yokes to reciprocate in vertical planes.

2. In a pump, a mobile frame, a shaft journaled in bearings on said frame, means carried by said frame for driving said shaft, eccentrics carried by said shaft, yokes encircling said eccentrics, an arm depending from each yoke, vertical guides mounted on the frame for the lower ends of said arms, means for connecting the lower end of one of the depending arms to a pump rod and a counterbalancing Weight depending from the other 3. In a pump, a mobile frame, a shaft journaled in bearings on said frame, means carried by said frame for driving said shaft, eccentrics carried by said shaft, yokes encircling said eccentrics, an arm depending from each yoke, vertical guides mounted on said frame for the lower ends of said arms, antifriction bearings between said arms and guides, meansA for connecting the lower end or one of the depending arms to a pump rod and a` counterbalancing vvweight depending from the other arm.

4. In a pump, a frame, a shaft journaled thereon, means carried by said frame for driving said shaft, eccentrics on said shaft, yokes encircling said eccentrics, arms depending from said yokes, antifriction members carried by the lower portions of lsaid arms, vertically disposed guides mounted on said frame for said antifriction members,

means for connecting the lower end of one of said arms with a pump rod and a counterbalancing weight depending from theother arm.l

5. In a pump, a frame, vertical guides on opposite sides of said frame, antifriction members'arranged for reciprocating Vmovement between said guides, means Yfor connecting one of said'antifriction members to a pump rod, a counterbalancing weight depending from theother reciprocating member, a shaft journaled'on said frame, means fordriving'said shaft and means carried by said shaft for converting the rotary movement thereof into reciprocating movement and transmitting same to said reciprocatory members. 6. In a pump, a mobile frame, a shaft journaled in the upper portion of caid frame, means carried by the frame for driving said shaft, oppositely disposedeccentrics mounted on said shaft, yokes bearing upon and depending from said eccentrics,

vertically disposed guides on said frame, antifric- 525 tion bearings carried bysaid yokes and operating `ing one of said yokes to a pump rod, vertically disposed guides mounted on the irame'b'elow the yother yoke, antifriction bearings carried by the last mentioned yoke and arranged for'operation between said guides and a counter-balancing weight` suspended'from saidlast mentioned yoke and antifrictionbearings.

FRANK M. GILSTRAP. FRED W, BAURMANN. 

